The thumbprint or fingerprint deal reminded me of a '93 Pace Car a friend of mine owned, a 7,000 mile car bought from a dealer in either Ohio or Indiana years ago, had a "funny" spot in the quarter panel - one of our local painters took the quarter down to bare metal and discovered a perfect handprint in rust under the paint. Obviously, the don't-touch-the-bare-body protocol wasn't reinforced at that later date, either.
Pace Car decals were in the trunk on that car. too - original GM box. I wish I had owned a digital camera (or that my flip phone had even had a camera !) at that point. Still taking pics with film, then -
Regards,
Steve